FCC 73.701 Revised as of October 1, 2007
Goto Year:2006 |
2008
Sec. 73.701 Definitions.
The following definitions apply to terminology employed in this subpart:
(a) International broadcast stations. A broadcasting station employing
frequencies allocated to the broadcasting service between 5900 and 26100
kHz, the transmissions of which are intended to be received directly by the
general public in foreign countries. (A station may be authorized more than
one transmitter.) There are both Federal and non-Federal Government
international broadcast stations; only the latter are licensed by the
Commission and are subject to the rules of this subpart.
(b) Transmitter-hour. One frequency used on one transmitter for one hour.
(c) Frequency-hour. One frequency used for one hour regardless of the number
of transmitters over which it is simultaneously broadcast by a station
during that hour.
(d) Multiple operation. Broadcasting by a station on one frequency over two
or more transmitters simultaneously. If a station uses the same frequency
simultaneously on each of two (three, etc.) transmitters for an hour, it
uses one frequency-hour and two (three, etc.) transmitter-hours.
(e) Coordinated Universal Time (UTC). Time scale, based on the second (SI),
as defined in Recommendation ITU–R TF.460–6. For most practical purposes
associated with the ITU Radio Regulations, UTC is equivalent to mean solar
time at the prime meridian (0 ° longitude), formerly expressed in GMT. (RR)
(f) Sunspot number. The 12–month running average of the number of sunspots
for any month as indicated in the U.S. Department of Commerce
Telecommunications Research and Engineering Report No. 13—available from the
Superintendent of Documents, Washington, DC 20402. The sunspot number varies
in an approximate 11–year cycle.
(g) Day. Any twenty-four hour period beginning 0100 UTC and ending 0100 UTC.
(h) Schedule A. That portion of any year commencing at 0100 UTC on the last
Sunday in March and ending at 0100 UTC on the last Sunday in October.
(i) Schedule B. That portion of any year commencing at 0100 UTC on the last
Sunday in October and ending at 0100 UTC on the last Sunday in March.
(j) [Reserved]
(k) Seasonal schedule. An assignment, for a season, of a frequency or
frequencies, and other technical parameters, to be used by a station for
transmission to particular zones or areas of reception during specified
hours.
(l) Reference month. That month of a season which is used for determining
predicted propagation characteristics for the season. The reference month
for Schedule A is July and the reference month for Schedule B is December.
(m) Maximum usable frequency ( MUF ). The highest frequency which is
returned by ionospheric radio propagation to the surface of the earth for a
particular path and time of day for 50 percent of the days of the reference
month.
(n) Optimum working frequency ( FOT ). The highest frequency which is
returned by ionospheric radio propagation to the surface of the earth for a
particular path and time of day for 90 percent of the days of the reference
month.
Note: The international abbreviation for optimum working frequency, FOT, is
formed with the initial letters of the French words for “optimum working
frequency” which are “frequence optimum de travail.”
(o) Zone of reception. Any geographic zone indicated in Sec. 73.703 in which the
reception of particular programs is specifically intended and in which
broadcast coverage is contemplated.
(p) Area of reception. Any geographic area smaller than a zone of reception
in which the reception of particular programs is specifically intended and
in which broadcast coverage is contemplated, such areas being indicated by
countries or parts of countries.
(q) Delivered median field strength, or field strength. The field strength
incident upon the zone or area of reception expressed in microvolts per
meter, or decibels above one microvolt per meter, which is exceeded by the
hourly median value for 50 percent of the days of the reference month.
(r) Carrier power. The average power supplied to the antenna transmission
line by a transmitter during one radio frequency cycle under conditions of
no modulation.
[ 38 FR 18892 , July 16, 1973, as amended at 68 FR 25538 , May 13, 2003; 70 FR 46676 , Aug. 10, 2005]
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